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x in (-oo:+oo)
0 = -((2/5)*x)-y-2 // + -((2/5)*x)-y-2
(2/5)*x+y+0+2 = 0
2/5*x+y+2 = 0 // - y+2
2/5*x = -(y+2) // : 2/5
x = (-(y+2))/2/5
x = -5/2*(y+2)
x = -5/2*(y+2)
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